江苏某地互层状土的岩土工程特性

互层状土是具有某种特殊性质的土层.基于江苏某地互层状土的室内土工试验成果,结合现场原位测试的相关数据,全面阐述互层状土在物理、力学、水理等岩土工程特性,针对互层状土的室内土工试验方法和试验成果的选择提出相关建议,可供类似土层的工程勘察、室内土工试验参考.     

基于多步优化策略的地声参数反演方法与研究

传统的地声参数多步优化反演方法大多选用同一代价函数对不同频段进行反演。文章提出一种新的地声参数反演多步优化策略,针对不同参数选择不同类型的代价函数和信号频段,并应用于某海试实验数据处理,验证了其有效性。     

The use of hydrogen as a fuel for inland waterway units

Escalating apprehension about the harmful effects of widespread use of conventional fossil fuels in the marine field and in internal combustion engines in general, has led to a vast amount of efforts and the directing of large capital investment towards research and development of sustainable alternative energy sources. One of the most promising and abundant of these sources is hydrogen. Firstly, the use of current fossil fuels is. discussed focusing on the emissions and economic sides to emphasize the need for a new, cleaner and renewable fuel with particular reference to hydrogen as a suitable possible alternative. Hydrogen properties, production and storage methods are then reviewed along with its suitability from the economical point of view. Finally, a cost analysis for the use of hydrogen in internal combustion engines is carried out to illustrate the benefits of its use as a replacement for diesel. The outcome of this cost analysis shows that 98% of the capital expenditure is consumed by the equipment, and 68.3% of the total cost of the equipment is spent on the solar photovoltaic cells. The hydrogen plant is classified as a large investment project because of its high initial cost which is about 1 billion US$; but this is justified because hydrogen is produced in a totally green way. When hydrogen is used as a fuel, no harmful emissions are obtained.     

健康体检中胸透效用的探讨

本文通过对江西大学1977～1987年的新生入学等健康体检共23682人次胸透阳性率的调查及1986～1987年的同一人群结核菌素筛选与胸透普查肺结核病检出率的对比研究,就胸透在健康体检中的效用问题进行了一些分析和探讨.使我们较清楚地认识到:正当、合理地应用X 线这一诊断方法,避免一切不必要的医用X线照射,减少它给人类带来的辐射晚期效应和某些遗传性危害,是保护人民身体健康的重要环节.     

Quasi-Monte Carlo Simulation-Based SFEM for Slope Reliability Analysis

Considering the stochastic spatial variation of geotechnical parameters over the slope, a Stochastic Finite Element Method (SFEM) is established based on the combination of the Shear Strength Reduction (SSR) concept and quasi-Monte Carlo simulation. The shear strength reduction FEM is superior to the slice method based on the limit equilibrium theory in many ways, so it will be more powerful to assess the reliability of global slope stability when combined with probability theory. To illustrate the performance of the proposed method, it is applied to an example of simple slope. The results of simulation show that the proposed method is effective to perform the reliability analysis of global slope stability without presupposing a potential slip surface.     

基于门限关联度的传动箱性能检测方法研究

使用振动加速度传感器获取传动箱振动信号，应用概率统计方法建立了传动箱标准正常状态模式，并计算振动信号与标准正常模式的门限关联度．结果表明，所得门限关联度可以反映传动箱当前的性能状况，全部检测过程均在计算机上进行．     

马蹄香的生药学研究

首次报道中国特产植物药马蹄香（Ｓａｒｕｍａｈｅｎｒｙｉ）的原植物、生药性状、显微结构及有关成分的理化鉴别，为准确的鉴别药材及开发利用研究提供依据。     

锚固注浆体性能试验研究

水泥基注浆体广泛地应用于锚固工程中,其物理力学特性是锚固体系优化设计的关键参数,当今所有的锚固规范仅对注浆体的水泥标号及抗压强度等级作了相应规定,有关注浆体方面的研究还较少。因此,在广泛调研实体工程所使用的注浆体的情况下,设计11种不同配合比的注浆体,分别测试各自的物理力学性能,采用室内抗拔试验研究其对锚固性能的影响。结果表明:降低注浆体的水灰比对提高岩锚的极限抗拔荷载的效率较低,而在注浆体中掺入适量的砂可以提高注浆体的抗拉强度、弹性模量及剪切模量,增强岩锚的界面黏结强度及锚固刚度,从而显著改善岩锚的锚固性能。     

减水剂对水泥稳定碎石性能的影响

通过水泥稳定碎石基层掺加减水剂的试验，研究减水剂对水泥稳定碎石性能的彰响，特别是收缩性能。试验结果表明，适量的减水剂能降低基层材料的收缩量；不同类型的减水剂对收缩性能影响差异性不大。     

沥青路面冷再生混合料疲劳性能

通过劈裂拉伸和控制应力的方式对再生混合料的疲劳性能进行了室内试验研究，总结了疲劳方程和疲劳曲线，分析了温度对疲劳性能的影响，并与相似试验条件下一般水泥稳定类材料的疲劳规律进行了比较。结果表明，随温度降低再生混合料的疲劳阻抗提高了，同时其疲劳寿命对应力水平的敏感程度也有所增强，在高应力水平下其具有比一般水泥稳定类材料更为优越的疲劳性能。